Rear-Gate moaning and groaning.........

07 EL..........My rear gate lift-acuator moans and groans, pretty nasty sounding. I ran it down to the top attachment point. Lubed the piviot on the plunger and the post it mounts on with no luck. Anybody had this problem??
Thanks,
Jimbo

My automatic opener/closer would moan and groan while in the closing operation, it got louder if it was hotter outside. Dealer replaced the open/close motor and and black arm thing under warranty no problems since.